From what I gathered, I felt that A was a good person, even he did mess up some people's lives when he inhabited them. I was angry at him for destroying and upsetting people's lives, because he left them in a bit of a mess, like with Nathan and the boy in the library. To me, I felt like that A was a boy, by the way he talked, and how he loved Rhiannon who was a girl. I thought he rushed things a bit, but I guess it was because he he thought his time was limited, and it was.
The ending just didn't work with me. I thought the writer just slowly must of drifted off and decided they had better things to do and just finished it off. Maybe they could of just added more of a motive for A, like getting a real body, without destroying another's. If the writer put a little more effort in, then the story would of been perfect.
Every Day was a really great book at the start, then the plot was dragged out, but otherwise was perfect. This is a great book, and I think that people should give it a try.